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Simplifying 3n + 9(n + 7) = 135 Reorder the terms: 3n + 9(7 + n) = 135 3n + (7 * 9 + n * 9) = 135 3n + (63 + 9n) = 135 Reorder the terms: 63 + 3n + 9n = 135 Combine like terms: 3n + 9n = 12n 63 + 12n = 135 Solving 63 + 12n = 135 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 12n = 135 + -63 Combine like terms: 63 + -63 = 0 0 + 12n = 135 + -63 12n = 135 + -63 Combine like terms: 135 + -63 = 72 12n = 72 Divide each side by '12'. n = 6 Simplifying n = 6
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